【題目】It has been proved ______ he is a smart boy.

A. whoB. whatC. thatD. which

【答案】C

【解析】

句意：已經(jīng)證明他是一個(gè)聰明的男孩。who誰(shuí)，what什么，that那個(gè)，which哪一個(gè)。It has been proved that+從句，“已經(jīng)證明……”，it是形式主語(yǔ)，that引導(dǎo)的真正主語(yǔ)。故選C。

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